From: Numan Siddique <num...@ovn.org>

Since northd tracked data has the changed lb data, northd
engine handler for lflow engine now handles the lb changes
incrementally.  All the lflows generated for each lb is
stored in the ovn_lb_datapaths->lflow_ref and this is used
similar to how we handle ovn_port changes.

Signed-off-by: Numan Siddique <num...@ovn.org>
---
 northd/en-lflow.c   |  11 ++-
 northd/lb.c         |   3 +
 northd/lb.h         |  26 +++++
 northd/lflow-mgr.c  |  47 +++++++--
 northd/northd.c     |  95 +++++++++++++++---
 northd/northd.h     |   4 +
 tests/ovn-northd.at | 231 ++++++++++++++++++++++++++++++++++++++++++--
 7 files changed, 382 insertions(+), 35 deletions(-)

diff --git a/northd/en-lflow.c b/northd/en-lflow.c
index fef9a1352d..205605578f 100644
--- a/northd/en-lflow.c
+++ b/northd/en-lflow.c
@@ -123,11 +123,6 @@ lflow_northd_handler(struct engine_node *node,
         return false;
     }
 
-    /* Fall back to recompute if load balancers have changed. */
-    if (northd_has_lbs_in_tracked_data(&northd_data->trk_data)) {
-        return false;
-    }
-
     const struct engine_context *eng_ctx = engine_get_context();
     struct lflow_data *lflow_data = data;
 
@@ -140,6 +135,12 @@ lflow_northd_handler(struct engine_node *node,
         return false;
     }
 
+    if (!lflow_handle_northd_lb_changes(eng_ctx->ovnsb_idl_txn,
+                                &northd_data->trk_data.trk_lbs,
+                                &lflow_input, lflow_data->lflow_table)) {
+        return false;
+    }
+
     engine_set_node_state(node, EN_UPDATED);
     return true;
 }
diff --git a/northd/lb.c b/northd/lb.c
index e6c8a51911..5fca41e049 100644
--- a/northd/lb.c
+++ b/northd/lb.c
@@ -21,6 +21,7 @@
 
 /* OVN includes */
 #include "lb.h"
+#include "lflow-mgr.h"
 #include "lib/lb.h"
 #include "northd.h"
 
@@ -33,6 +34,7 @@ ovn_lb_datapaths_create(const struct ovn_northd_lb *lb, 
size_t n_ls_datapaths,
     lb_dps->lb = lb;
     lb_dps->nb_ls_map = bitmap_allocate(n_ls_datapaths);
     lb_dps->nb_lr_map = bitmap_allocate(n_lr_datapaths);
+    lb_dps->lflow_ref = lflow_ref_create();
 
     return lb_dps;
 }
@@ -42,6 +44,7 @@ ovn_lb_datapaths_destroy(struct ovn_lb_datapaths *lb_dps)
 {
     bitmap_free(lb_dps->nb_lr_map);
     bitmap_free(lb_dps->nb_ls_map);
+    lflow_ref_destroy(lb_dps->lflow_ref);
     free(lb_dps);
 }
 
diff --git a/northd/lb.h b/northd/lb.h
index eeef2ea260..de677ca4ef 100644
--- a/northd/lb.h
+++ b/northd/lb.h
@@ -20,6 +20,8 @@
 #include "openvswitch/hmap.h"
 #include "uuid.h"
 
+struct lflow_ref;
+
 struct ovn_lb_datapaths {
     struct hmap_node hmap_node;
 
@@ -29,6 +31,30 @@ struct ovn_lb_datapaths {
 
     size_t n_nb_lr;
     unsigned long *nb_lr_map;
+
+    /* Reference of lflows generated for this load balancer.
+     *
+     * This data is initialized and destroyed by the en_northd node, but
+     * populated and used only by the en_lflow node. Ideally this data should
+     * be maintained as part of en_lflow's data (struct lflow_data): a hash
+     * index from ovn_port key to lflows.  However, it would be less efficient
+     * and more complex:
+     *
+     * 1. It would require an extra search (using the index) to find the
+     * lflows.
+     *
+     * 2. Building the index needs to be thread-safe, using either a global
+     * lock which is obviously less efficient, or hash-based lock array which
+     * is more complex.
+     *
+     * Maintaining the lflow_ref here is more straightforward. The drawback is
+     * that we need to keep in mind that this data belongs to en_lflow node,
+     * so never access it from any other nodes.
+     *
+     * 'lflow_ref' is used to reference logical flows generated for this
+     *  load balancer.
+     */
+    struct lflow_ref *lflow_ref;
 };
 
 struct ovn_lb_datapaths *ovn_lb_datapaths_create(const struct ovn_northd_lb *,
diff --git a/northd/lflow-mgr.c b/northd/lflow-mgr.c
index e762f5fd51..15f72ae736 100644
--- a/northd/lflow-mgr.c
+++ b/northd/lflow-mgr.c
@@ -378,7 +378,15 @@ struct lflow_ref_node {
     /* The lflow. */
     struct ovn_lflow *lflow;
 
-    /* Index id of the datapath this lflow_ref_node belongs to. */
+    /* Indicates of the lflow was added with dp_group or not using
+     * ovn_lflow_add_with_dp_group() macro. */
+    bool dpgrp_lflow;
+    /* dpgrp bitmap and bitmap length.  Valid only of dpgrp_lflow is true. */
+    unsigned long *dpgrp_bitmap;
+    size_t dpgrp_bitmap_len;
+
+    /* Index id of the datapath this lflow_ref_node belongs to.
+     * Valid only if dpgrp_lflow is false. */
     size_t dp_index;
 
     /* Indicates if the lflow_ref_node for an lflow - L(M, A) is linked
@@ -432,9 +440,19 @@ lflow_ref_unlink_lflows(struct lflow_ref *lflow_ref)
     struct lflow_ref_node *lrn;
 
     LIST_FOR_EACH (lrn, lflow_list_node, &lflow_ref->lflows_ref_list) {
-        if (dec_dp_refcnt(&lrn->lflow->dp_refcnts_map,
-                          lrn->dp_index)) {
-            bitmap_set0(lrn->lflow->dpg_bitmap, lrn->dp_index);
+        if (lrn->dpgrp_lflow) {
+            size_t index;
+            BITMAP_FOR_EACH_1 (index, lrn->dpgrp_bitmap_len,
+                               lrn->dpgrp_bitmap) {
+                if (dec_dp_refcnt(&lrn->lflow->dp_refcnts_map, index)) {
+                    bitmap_set0(lrn->lflow->dpg_bitmap, lrn->dp_index);
+                }
+            }
+        } else {
+            if (dec_dp_refcnt(&lrn->lflow->dp_refcnts_map,
+                              lrn->dp_index)) {
+                bitmap_set0(lrn->lflow->dpg_bitmap, lrn->dp_index);
+            }
         }
 
         lrn->linked = false;
@@ -505,18 +523,26 @@ lflow_table_add_lflow(struct lflow_table *lflow_table,
                          io_port, ctrl_meter, stage_hint, where);
 
     if (lflow_ref) {
-        /* lflow referencing is only supported if 'od' is not NULL. */
-        ovs_assert(od);
-
         struct lflow_ref_node *lrn =
             lflow_ref_node_find(&lflow_ref->lflow_ref_nodes, lflow, hash);
         if (!lrn) {
             lrn = xzalloc(sizeof *lrn);
             lrn->lflow = lflow;
-            lrn->dp_index = od->index;
+            lrn->dpgrp_lflow = !od;
+            if (lrn->dpgrp_lflow) {
+                lrn->dpgrp_bitmap = bitmap_clone(dp_bitmap, dp_bitmap_len);
+                lrn->dpgrp_bitmap_len = dp_bitmap_len;
+
+                size_t index;
+                BITMAP_FOR_EACH_1 (index, dp_bitmap_len, dp_bitmap) {
+                    inc_dp_refcnt(&lflow->dp_refcnts_map, index);
+                }
+            } else {
+                lrn->dp_index = od->index;
+                inc_dp_refcnt(&lflow->dp_refcnts_map, lrn->dp_index);
+            }
             ovs_list_insert(&lflow_ref->lflows_ref_list,
                             &lrn->lflow_list_node);
-            inc_dp_refcnt(&lflow->dp_refcnts_map, lrn->dp_index);
             ovs_list_insert(&lflow->referenced_by, &lrn->ref_list_node);
 
             hmap_insert(&lflow_ref->lflow_ref_nodes, &lrn->ref_node, hash);
@@ -1233,5 +1259,8 @@ lflow_ref_node_destroy(struct lflow_ref_node *lrn,
     }
     ovs_list_remove(&lrn->lflow_list_node);
     ovs_list_remove(&lrn->ref_list_node);
+    if (lrn->dpgrp_lflow) {
+        bitmap_free(lrn->dpgrp_bitmap);
+    }
     free(lrn);
 }
diff --git a/northd/northd.c b/northd/northd.c
index 85b6209f8f..1ea652430f 100644
--- a/northd/northd.c
+++ b/northd/northd.c
@@ -7467,7 +7467,7 @@ build_lb_rules_pre_stateful(struct lflow_table *lflows,
         ovn_lflow_add_with_dp_group(
             lflows, lb_dps->nb_ls_map, ods_size(ls_datapaths),
             S_SWITCH_IN_PRE_STATEFUL, 120, ds_cstr(match), ds_cstr(action),
-            &lb->nlb->header_, NULL);
+            &lb->nlb->header_, lb_dps->lflow_ref);
     }
 }
 
@@ -7912,7 +7912,7 @@ build_lb_rules(struct lflow_table *lflows, struct 
ovn_lb_datapaths *lb_dps,
         }
 
         build_lb_affinity_ls_flows(lflows, lb_dps, lb_vip, ls_datapaths,
-                                   NULL);
+                                   lb_dps->lflow_ref);
 
         unsigned long *dp_non_meter = NULL;
         bool build_non_meter = false;
@@ -7936,7 +7936,7 @@ build_lb_rules(struct lflow_table *lflows, struct 
ovn_lb_datapaths *lb_dps,
                         lflows, od, S_SWITCH_IN_LB, priority,
                         ds_cstr(match), ds_cstr(action),
                         NULL, meter, &lb->nlb->header_,
-                        NULL);
+                        lb_dps->lflow_ref);
             }
         }
         if (!reject || build_non_meter) {
@@ -7944,7 +7944,7 @@ build_lb_rules(struct lflow_table *lflows, struct 
ovn_lb_datapaths *lb_dps,
                 lflows, dp_non_meter ? dp_non_meter : lb_dps->nb_ls_map,
                 ods_size(ls_datapaths), S_SWITCH_IN_LB, priority,
                 ds_cstr(match), ds_cstr(action), &lb->nlb->header_,
-                NULL);
+                lb_dps->lflow_ref);
         }
         bitmap_free(dp_non_meter);
     }
@@ -9365,7 +9365,7 @@ build_lswitch_arp_nd_service_monitor(const struct 
ovn_lb_datapaths *lb_dps,
                                     S_SWITCH_IN_ARP_ND_RSP, 110,
                                     ds_cstr(match), ds_cstr(actions),
                                     &lb->nlb->header_,
-                                    NULL);
+                                    lb_dps->lflow_ref);
         }
     }
 }
@@ -11387,7 +11387,8 @@ build_lrouter_nat_flows_for_lb(
         if (!od->n_l3dgw_ports) {
             bitmap_set1(gw_dp_bitmap[type], index);
         } else {
-            build_distr_lrouter_nat_flows_for_lb(&ctx, type, od, NULL);
+            build_distr_lrouter_nat_flows_for_lb(&ctx, type, od,
+                                                 lb_dps->lflow_ref);
         }
 
         if (lb->affinity_timeout) {
@@ -11408,17 +11409,17 @@ build_lrouter_nat_flows_for_lb(
              * S_ROUTER_IN_DNAT stage. */
             ovn_lflow_add_with_hint(lflows, od, S_ROUTER_IN_UNSNAT, 120,
                                     ds_cstr(&unsnat_match), "next;",
-                                    &lb->nlb->header_, NULL);
+                                    &lb->nlb->header_, lb_dps->lflow_ref);
         }
     }
 
     for (size_t type = 0; type < LROUTER_NAT_LB_FLOW_MAX; type++) {
         build_gw_lrouter_nat_flows_for_lb(&ctx, type, lr_datapaths,
                                           gw_dp_bitmap[type],
-                                          NULL);
+                                          lb_dps->lflow_ref);
         build_lb_affinity_lr_flows(lflows, lb, lb_vip, ds_cstr(match),
                                    aff_action[type], aff_dp_bitmap[type],
-                                   lr_datapaths, NULL);
+                                   lr_datapaths, lb_dps->lflow_ref);
     }
 
     ds_destroy(&unsnat_match);
@@ -11467,7 +11468,7 @@ build_lswitch_flows_for_lb(struct ovn_lb_datapaths 
*lb_dps,
                                                      od->nbs->copp,
                                                      meter_groups),
                                       &lb->nlb->header_,
-                                      NULL);
+                                      lb_dps->lflow_ref);
         }
         /* Ignore L4 port information in the key because fragmented packets
          * may not have L4 information.  The pre-stateful table will send
@@ -11517,7 +11518,7 @@ build_lrouter_defrag_flows_for_lb(struct 
ovn_lb_datapaths *lb_dps,
         ovn_lflow_add_with_dp_group(
             lflows, lb_dps->nb_lr_map, ods_size(lr_datapaths),
             S_ROUTER_IN_DEFRAG, prio, ds_cstr(match), "ct_dnat;",
-            &lb_dps->lb->nlb->header_, NULL);
+            &lb_dps->lb->nlb->header_, lb_dps->lflow_ref);
     }
 }
 
@@ -11559,7 +11560,7 @@ build_lrouter_flows_for_lb(struct ovn_lb_datapaths 
*lb_dps,
                                       copp_meter_get(COPP_EVENT_ELB,
                                                      od->nbr->copp,
                                                      meter_groups),
-                                      &lb->nlb->header_, NULL);
+                                      &lb->nlb->header_, lb_dps->lflow_ref);
         }
     }
 
@@ -11569,7 +11570,7 @@ build_lrouter_flows_for_lb(struct ovn_lb_datapaths 
*lb_dps,
 
             ovn_lflow_add(lflows, od, S_ROUTER_OUT_SNAT, 120,
                           "flags.skip_snat_for_lb == 1 && ip", "next;",
-                          NULL);
+                          lb_dps->lflow_ref);
         }
     }
 }
@@ -16378,6 +16379,7 @@ void build_lflows(struct ovsdb_idl_txn *ovnsb_txn,
 void
 lflow_reset_northd_refs(struct lflow_input *lflow_input)
 {
+    struct ovn_lb_datapaths *lb_dps;
     struct ovn_port *op;
 
     HMAP_FOR_EACH (op, key_node, lflow_input->ls_ports) {
@@ -16389,6 +16391,10 @@ lflow_reset_northd_refs(struct lflow_input 
*lflow_input)
         lflow_ref_clear(op->lflow_ref);
         lflow_ref_clear(op->stateful_lflow_ref);
     }
+
+    HMAP_FOR_EACH (lb_dps, hmap_node, lflow_input->lb_datapaths_map) {
+        lflow_ref_clear(lb_dps->lflow_ref);
+    }
 }
 
 bool
@@ -16550,6 +16556,69 @@ lflow_handle_northd_port_changes(struct ovsdb_idl_txn 
*ovnsb_txn,
     return true;
 }
 
+bool
+lflow_handle_northd_lb_changes(struct ovsdb_idl_txn *ovnsb_txn,
+                               struct tracked_lbs *trk_lbs,
+                               struct lflow_input *lflow_input,
+                               struct lflow_table *lflows)
+{
+    struct ovn_lb_datapaths *lb_dps;
+    struct hmapx_node *hmapx_node;
+    HMAPX_FOR_EACH (hmapx_node, &trk_lbs->deleted) {
+        lb_dps = hmapx_node->data;
+
+        lflow_ref_resync_flows(
+            lb_dps->lflow_ref, lflows, ovnsb_txn, lflow_input->ls_datapaths,
+            lflow_input->lr_datapaths,
+            lflow_input->ovn_internal_version_changed,
+            lflow_input->sbrec_logical_flow_table,
+            lflow_input->sbrec_logical_dp_group_table);
+    }
+
+    HMAPX_FOR_EACH (hmapx_node, &trk_lbs->crupdated) {
+        lb_dps = hmapx_node->data;
+
+        /* unlink old lflows. */
+        lflow_ref_unlink_lflows(lb_dps->lflow_ref);
+
+        /* Generate new lflows. */
+        struct ds match = DS_EMPTY_INITIALIZER;
+        struct ds actions = DS_EMPTY_INITIALIZER;
+
+        build_lswitch_arp_nd_service_monitor(lb_dps, lflow_input->ls_ports,
+                                             lflows, &actions,
+                                             &match);
+        build_lrouter_defrag_flows_for_lb(lb_dps, lflows,
+                                          lflow_input->lr_datapaths, &match);
+        build_lrouter_flows_for_lb(lb_dps, lflows,
+                                   lflow_input->meter_groups,
+                                   lflow_input->lr_datapaths,
+                                   lflow_input->lr_stateful_table,
+                                   lflow_input->features,
+                                   lflow_input->svc_monitor_map,
+                                   &match, &actions);
+        build_lswitch_flows_for_lb(lb_dps, lflows,
+                                   lflow_input->meter_groups,
+                                   lflow_input->ls_datapaths,
+                                   lflow_input->features,
+                                   lflow_input->svc_monitor_map,
+                                   &match, &actions);
+
+        ds_destroy(&match);
+        ds_destroy(&actions);
+
+        /* Sync the new flows to SB. */
+        lflow_ref_sync_lflows(lb_dps->lflow_ref, lflows, ovnsb_txn,
+                              lflow_input->ls_datapaths,
+                              lflow_input->lr_datapaths,
+                              lflow_input->ovn_internal_version_changed,
+                              lflow_input->sbrec_logical_flow_table,
+                              lflow_input->sbrec_logical_dp_group_table);
+    }
+
+    return true;
+}
+
 static bool
 mirror_needs_update(const struct nbrec_mirror *nb_mirror,
                     const struct sbrec_mirror *sb_mirror)
diff --git a/northd/northd.h b/northd/northd.h
index e0d34b545c..6f5ff506ec 100644
--- a/northd/northd.h
+++ b/northd/northd.h
@@ -672,6 +672,10 @@ bool lflow_handle_northd_port_changes(struct ovsdb_idl_txn 
*ovnsb_txn,
                                       struct tracked_ovn_ports *,
                                       struct lflow_input *,
                                       struct lflow_table *lflows);
+bool lflow_handle_northd_lb_changes(struct ovsdb_idl_txn *ovnsb_txn,
+                                    struct tracked_lbs *,
+                                    struct lflow_input *,
+                                    struct lflow_table *lflows);
 bool northd_handle_sb_port_binding_changes(
     const struct sbrec_port_binding_table *, struct hmap *ls_ports,
     struct hmap *lr_ports);
diff --git a/tests/ovn-northd.at b/tests/ovn-northd.at
index 0952bfa2b8..edc95b6c88 100644
--- a/tests/ovn-northd.at
+++ b/tests/ovn-northd.at
@@ -10519,7 +10519,7 @@ check ovn-nbctl --wait=sb lb-add lb1 10.0.0.10:80 
10.0.0.3:80
 
 check_engine_stats lb_data norecompute compute
 check_engine_stats northd norecompute compute
-check_engine_stats lflow recompute nocompute
+check_engine_stats lflow norecompute compute
 check_engine_stats sync_to_sb_lb recompute nocompute
 
 CHECK_NO_CHANGE_AFTER_RECOMPUTE(1)
@@ -10529,21 +10529,26 @@ check ovn-nbctl --wait=sb set load_balancer . 
ip_port_mappings:10.0.0.3=sw0-p1:1
 check_engine_stats lb_data norecompute compute
 check_engine_stats northd norecompute compute
 check_engine_stats lr_stateful norecompute compute
-check_engine_stats lflow recompute nocompute
+check_engine_stats lflow norecompute compute
 check_engine_stats sync_to_sb_lb recompute nocompute
+CHECK_NO_CHANGE_AFTER_RECOMPUTE
 
+check as northd ovn-appctl -t ovn-northd inc-engine/clear-stats
+check as northd ovn-appctl -t ovn-northd inc-engine/clear-stats
 check ovn-nbctl --wait=sb set load_balancer . options:foo=bar
 check_engine_stats lb_data norecompute compute
 check_engine_stats northd norecompute compute
 check_engine_stats lr_stateful norecompute compute
-check_engine_stats lflow recompute nocompute
+check_engine_stats lflow norecompute compute
 check_engine_stats sync_to_sb_lb recompute nocompute
+CHECK_NO_CHANGE_AFTER_RECOMPUTE
+check as northd ovn-appctl -t ovn-northd inc-engine/clear-stats
 
 check ovn-nbctl --wait=sb -- lb-add lb2 20.0.0.10:80 20.0.0.20:80 -- lb-add 
lb3 30.0.0.10:80 30.0.0.20:80
 check_engine_stats lb_data norecompute compute
 check_engine_stats northd norecompute compute
 check_engine_stats lr_stateful norecompute compute
-check_engine_stats lflow recompute nocompute
+check_engine_stats lflow norecompute compute
 check_engine_stats sync_to_sb_lb recompute nocompute
 
 CHECK_NO_CHANGE_AFTER_RECOMPUTE(1)
@@ -10553,7 +10558,7 @@ check ovn-nbctl --wait=sb -- lb-del lb2 -- lb-del lb3
 check_engine_stats lb_data norecompute compute
 check_engine_stats northd norecompute compute
 check_engine_stats lr_stateful norecompute compute
-check_engine_stats lflow recompute nocompute
+check_engine_stats lflow norecompute compute
 check_engine_stats sync_to_sb_lb recompute nocompute
 
 CHECK_NO_CHANGE_AFTER_RECOMPUTE(1)
@@ -10764,8 +10769,9 @@ check ovn-nbctl --wait=sb add load_balancer_group . 
load_Balancer $lb1_uuid
 check_engine_stats lb_data norecompute compute
 check_engine_stats northd norecompute compute
 check_engine_stats lr_stateful norecompute compute
-check_engine_stats lflow recompute nocompute
+check_engine_stats lflow norecompute compute
 check_engine_stats sync_to_sb_lb recompute nocompute
+CHECK_NO_CHANGE_AFTER_RECOMPUTE
 
 check as northd ovn-appctl -t ovn-northd inc-engine/clear-stats
 check ovn-nbctl --wait=sb clear load_balancer_group . load_Balancer
@@ -10780,7 +10786,7 @@ check as northd ovn-appctl -t ovn-northd 
inc-engine/clear-stats
 check ovn-nbctl --wait=sb add load_balancer_group . load_Balancer $lb1_uuid
 check_engine_stats lb_data norecompute compute
 check_engine_stats northd norecompute compute
-check_engine_stats lflow recompute nocompute
+check_engine_stats lflow norecompute compute
 check_engine_stats sync_to_sb_lb recompute nocompute
 CHECK_NO_CHANGE_AFTER_RECOMPUTE
 
@@ -10789,6 +10795,7 @@ check ovn-nbctl --wait=sb add logical_switch sw0 
load_balancer_group $lbg1_uuid
 check_engine_stats lb_data norecompute compute
 check_engine_stats northd norecompute compute
 check_engine_stats lr_stateful norecompute compute
+check_engine_stats ls_stateful norecompute compute
 check_engine_stats lflow recompute nocompute
 check_engine_stats sync_to_sb_lb recompute compute
 
@@ -10797,6 +10804,7 @@ check as northd ovn-appctl -t ovn-northd 
inc-engine/clear-stats
 check ovn-nbctl --wait=sb set load_balancer . options:bar=foo
 check_engine_stats lb_data norecompute compute
 check_engine_stats northd norecompute compute
+check_engine_stats ls_stateful norecompute compute
 check_engine_stats lflow recompute nocompute
 check_engine_stats sync_to_sb_lb recompute compute
 
@@ -10806,6 +10814,7 @@ check ovn-nbctl --wait=sb set load_balancer lb1 
vips:'"10.0.0.10:80"'='"10.0.0.1
 check_engine_stats lb_data norecompute compute
 check_engine_stats northd norecompute compute
 check_engine_stats lr_stateful norecompute compute
+check_engine_stats ls_stateful norecompute compute
 check_engine_stats lflow recompute nocompute
 check_engine_stats sync_to_sb_lb recompute compute
 CHECK_NO_CHANGE_AFTER_RECOMPUTE
@@ -10903,6 +10912,7 @@ check_engine_stats northd recompute nocompute
 check_engine_stats lr_stateful recompute nocompute
 check_engine_stats lflow recompute nocompute
 check_engine_stats sync_to_sb_lb recompute compute
+CHECK_NO_CHANGE_AFTER_RECOMPUTE
 
 # Add back lb group to logical switch and then delete it.
 check as northd ovn-appctl -t ovn-northd inc-engine/clear-stats
@@ -10912,6 +10922,7 @@ check_engine_stats northd norecompute compute
 check_engine_stats lr_stateful norecompute compute
 check_engine_stats lflow recompute nocompute
 check_engine_stats sync_to_sb_lb recompute compute
+CHECK_NO_CHANGE_AFTER_RECOMPUTE
 
 check as northd ovn-appctl -t ovn-northd inc-engine/clear-stats
 check ovn-nbctl --wait=sb clear logical_switch sw0 load_balancer_group -- \
@@ -10945,14 +10956,17 @@ check_engine_stats northd norecompute compute
 check_engine_stats lr_stateful norecompute compute
 check_engine_stats lflow norecompute nocompute
 check_engine_stats sync_to_sb_lb norecompute nocompute
+CHECK_NO_CHANGE_AFTER_RECOMPUTE
 
 check as northd ovn-appctl -t ovn-northd inc-engine/clear-stats
 check ovn-nbctl --wait=sb set load_balancer_group . 
load_balancer="$lb2_uuid,$lb3_uuid,$lb4_uuid"
 check_engine_stats lb_data norecompute compute
 check_engine_stats northd norecompute compute
+check_engine_stats ls_stateful norecompute compute
 check_engine_stats lr_stateful norecompute compute
-check_engine_stats lflow recompute nocompute
+check_engine_stats lflow norecompute compute
 check_engine_stats sync_to_sb_lb recompute nocompute
+CHECK_NO_CHANGE_AFTER_RECOMPUTE
 
 check as northd ovn-appctl -t ovn-northd inc-engine/clear-stats
 check ovn-nbctl --wait=sb set logical_switch sw0 load_balancer_group=$lbg1_uuid
@@ -11144,6 +11158,207 @@ CHECK_NO_CHANGE_AFTER_RECOMPUTE
 AT_CLEANUP
 ])
 
+OVN_FOR_EACH_NORTHD_NO_HV([
+AT_SETUP([Load balancer incremental processing for multiple LBs with same 
VIPs])
+ovn_start
+
+check ovn-nbctl ls-add sw0
+check ovn-nbctl ls-add sw1
+check ovn-nbctl lb-add lb1 10.0.0.10:80 10.0.0.3:80
+check ovn-nbctl --wait=sb lb-add lb2 10.0.0.10:80 10.0.0.3:80
+
+check as northd ovn-appctl -t ovn-northd inc-engine/clear-stats
+check ovn-nbctl --wait=sb ls-lb-add sw0 lb1
+check_engine_stats lflow recompute nocompute
+CHECK_NO_CHANGE_AFTER_RECOMPUTE
+
+lb_lflow_uuid=$(fetch_column Logical_flow _uuid match='"ct.new && ip4.dst == 
10.0.0.10 && tcp.dst == 80"')
+sw0_uuid=$(fetch_column Datapath_Binding _uuid external_ids:name=sw0)
+
+lb_lflow_dp=$(ovn-sbctl --bare --columns logical_datapath list logical_flow 
$lb_lflow_uuid)
+AT_CHECK([test "$lb_lflow_dp" = "$sw0_uuid"])
+
+lb_lflow_dpgrp=$(ovn-sbctl --bare --columns logical_dp_group list logical_flow 
$lb_lflow_uuid)
+AT_CHECK([test "$lb_lflow_dpgrp" = ""])
+
+check as northd ovn-appctl -t ovn-northd inc-engine/clear-stats
+check ovn-nbctl --wait=sb ls-lb-add sw1 lb2
+check_engine_stats lflow recompute nocompute
+CHECK_NO_CHANGE_AFTER_RECOMPUTE
+
+lb_lflow_dp=$(ovn-sbctl --bare --columns logical_datapath list logical_flow 
$lb_lflow_uuid)
+AT_CHECK([test "$lb_lflow_dp" = ""])
+
+lb_lflow_dpgrp=$(ovn-sbctl --bare --columns logical_dp_group list logical_flow 
$lb_lflow_uuid)
+AT_CHECK([test "$lb_lflow_dpgrp" != ""])
+
+check as northd ovn-appctl -t ovn-northd inc-engine/clear-stats
+check ovn-nbctl --wait=sb clear load_balancer lb2 vips
+check_engine_stats lflow recompute nocompute
+CHECK_NO_CHANGE_AFTER_RECOMPUTE
+
+lb_lflow_dp=$(ovn-sbctl --bare --columns logical_datapath list logical_flow 
$lb_lflow_uuid)
+AT_CHECK([test "$lb_lflow_dp" = "$sw0_uuid"])
+
+lb_lflow_dpgrp=$(ovn-sbctl --bare --columns logical_dp_group list logical_flow 
$lb_lflow_uuid)
+AT_CHECK([test "$lb_lflow_dpgrp" = ""])
+
+# Add back the vip to lb2.
+check ovn-nbctl lb-add lb2 10.0.0.10:80 10.0.0.3:80
+
+# Create additional logical switches and associate lb1 to sw0, sw1 and sw2
+# and associate lb2 to sw3, sw4 and sw5
+check ovn-nbctl ls-add sw2
+check ovn-nbctl ls-add sw3
+check ovn-nbctl ls-add sw4
+check ovn-nbctl ls-add sw5
+check ovn-nbctl --wait=sb ls-lb-del sw1 lb2
+check ovn-nbctl ls-lb-add sw1 lb1
+check ovn-nbctl ls-lb-add sw2 lb1
+check ovn-nbctl ls-lb-add sw3 lb2
+check ovn-nbctl ls-lb-add sw4 lb2
+
+check as northd ovn-appctl -t ovn-northd inc-engine/clear-stats
+check ovn-nbctl --wait=sb ls-lb-add sw5 lb2
+check_engine_stats lflow recompute nocompute
+CHECK_NO_CHANGE_AFTER_RECOMPUTE
+
+lb_lflow_dp=$(ovn-sbctl --bare --columns logical_datapath list logical_flow 
$lb_lflow_uuid)
+AT_CHECK([test "$lb_lflow_dp" = ""])
+
+lb_lflow_dpgrp=$(ovn-sbctl --bare --columns logical_dp_group list logical_flow 
$lb_lflow_uuid)
+AT_CHECK([test "$lb_lflow_dpgrp" != ""])
+
+sw1_uuid=$(fetch_column Datapath_Binding _uuid external_ids:name=sw1)
+sw2_uuid=$(fetch_column Datapath_Binding _uuid external_ids:name=sw2)
+sw3_uuid=$(fetch_column Datapath_Binding _uuid external_ids:name=sw3)
+sw4_uuid=$(fetch_column Datapath_Binding _uuid external_ids:name=sw4)
+sw5_uuid=$(fetch_column Datapath_Binding _uuid external_ids:name=sw5)
+
+dpgrp_dps=$(ovn-sbctl --bare --columns datapaths list logical_dp_group 
$lb_lflow_dpgrp)
+
+AT_CHECK([echo $dpgrp_dps | grep $sw0_uuid], [0], [ignore])
+AT_CHECK([echo $dpgrp_dps | grep $sw1_uuid], [0], [ignore])
+AT_CHECK([echo $dpgrp_dps | grep $sw2_uuid], [0], [ignore])
+AT_CHECK([echo $dpgrp_dps | grep $sw3_uuid], [0], [ignore])
+AT_CHECK([echo $dpgrp_dps | grep $sw4_uuid], [0], [ignore])
+AT_CHECK([echo $dpgrp_dps | grep $sw5_uuid], [0], [ignore])
+
+echo "dpgrp_dps - $dpgrp_dps"
+
+# Clear the vips for lb2.  The logical lb logical flow dp group should have
+# only sw0, sw1 and sw2 uuids.
+
+check as northd ovn-appctl -t ovn-northd inc-engine/clear-stats
+check ovn-nbctl --wait=sb clear load_balancer lb2 vips
+check_engine_stats lflow recompute nocompute
+CHECK_NO_CHANGE_AFTER_RECOMPUTE
+
+lb_lflow_dpgrp=$(ovn-sbctl --bare --columns logical_dp_group list logical_flow 
$lb_lflow_uuid)
+AT_CHECK([test "$lb_lflow_dpgrp" != ""])
+
+dpgrp_dps=$(ovn-sbctl --bare --columns datapaths list logical_dp_group 
$lb_lflow_dpgrp)
+
+AT_CHECK([echo $dpgrp_dps | grep $sw0_uuid], [0], [ignore])
+AT_CHECK([echo $dpgrp_dps | grep $sw1_uuid], [0], [ignore])
+AT_CHECK([echo $dpgrp_dps | grep $sw2_uuid], [0], [ignore])
+AT_CHECK([echo $dpgrp_dps | grep $sw3_uuid], [1], [ignore])
+AT_CHECK([echo $dpgrp_dps | grep $sw4_uuid], [1], [ignore])
+AT_CHECK([echo $dpgrp_dps | grep $sw5_uuid], [1], [ignore])
+
+# Clear the vips for lb1.  The logical flow should be deleted.
+check ovn-nbctl --wait=sb clear load_balancer lb1 vips
+
+AT_CHECK([ovn-sbctl --bare --columns logical_datapath list logical_flow 
$lb_lflow_uuid], [1], [ignore], [ignore])
+
+lb_lflow_uuid=$(fetch_column Logical_flow _uuid match='"ct.new && ip4.dst == 
10.0.0.10 && tcp.dst == 80"')
+AT_CHECK([test "$lb_lflow_uuid" = ""])
+
+
+# Now add back the vips,  create another lb with the same vips and associate to
+# sw0 and sw1
+check ovn-nbctl lb-add lb1 10.0.0.10:80 10.0.0.3:80
+check ovn-nbctl lb-add lb2 10.0.0.10:80 10.0.0.3:80
+check ovn-nbctl --wait=sb lb-add lb3 10.0.0.10:80 10.0.0.3:80
+
+check as northd ovn-appctl -t ovn-northd inc-engine/clear-stats
+
+check ovn-nbctl ls-lb-add sw0 lb3
+check ovn-nbctl --wait=sb ls-lb-add sw1 lb3
+check_engine_stats lflow recompute nocompute
+CHECK_NO_CHANGE_AFTER_RECOMPUTE
+
+lb_lflow_uuid=$(fetch_column Logical_flow _uuid match='"ct.new && ip4.dst == 
10.0.0.10 && tcp.dst == 80"')
+
+lb_lflow_dp=$(ovn-sbctl --bare --columns logical_datapath list logical_flow 
$lb_lflow_uuid)
+AT_CHECK([test "$lb_lflow_dp" = ""])
+
+lb_lflow_dpgrp=$(ovn-sbctl --bare --columns logical_dp_group list logical_flow 
$lb_lflow_uuid)
+AT_CHECK([test "$lb_lflow_dpgrp" != ""])
+
+dpgrp_dps=$(ovn-sbctl --bare --columns datapaths list logical_dp_group 
$lb_lflow_dpgrp)
+
+AT_CHECK([echo $dpgrp_dps | grep $sw0_uuid], [0], [ignore])
+AT_CHECK([echo $dpgrp_dps | grep $sw1_uuid], [0], [ignore])
+AT_CHECK([echo $dpgrp_dps | grep $sw2_uuid], [0], [ignore])
+AT_CHECK([echo $dpgrp_dps | grep $sw3_uuid], [0], [ignore])
+AT_CHECK([echo $dpgrp_dps | grep $sw4_uuid], [0], [ignore])
+AT_CHECK([echo $dpgrp_dps | grep $sw5_uuid], [0], [ignore])
+
+# Now clear lb1 vips.
+# Since lb3 is associated with sw0 and sw1, the logical flow db group
+# should have reference to sw0 and sw1, but not to sw2.
+check as northd ovn-appctl -t ovn-northd inc-engine/clear-stats
+check ovn-nbctl --wait=sb clear load_balancer lb1 vips
+check_engine_stats lflow recompute nocompute
+CHECK_NO_CHANGE_AFTER_RECOMPUTE
+
+lb_lflow_dp=$(ovn-sbctl --bare --columns logical_datapath list logical_flow 
$lb_lflow_uuid)
+AT_CHECK([test "$lb_lflow_dp" = ""])
+
+lb_lflow_dpgrp=$(ovn-sbctl --bare --columns logical_dp_group list logical_flow 
$lb_lflow_uuid)
+AT_CHECK([test "$lb_lflow_dpgrp" != ""])
+
+dpgrp_dps=$(ovn-sbctl --bare --columns datapaths list logical_dp_group 
$lb_lflow_dpgrp)
+
+echo "dpgrp dps - $dpgrp_dps"
+
+AT_CHECK([echo $dpgrp_dps | grep $sw0_uuid], [0], [ignore])
+AT_CHECK([echo $dpgrp_dps | grep $sw1_uuid], [0], [ignore])
+AT_CHECK([echo $dpgrp_dps | grep $sw2_uuid], [1], [ignore])
+AT_CHECK([echo $dpgrp_dps | grep $sw3_uuid], [0], [ignore])
+AT_CHECK([echo $dpgrp_dps | grep $sw4_uuid], [0], [ignore])
+AT_CHECK([echo $dpgrp_dps | grep $sw5_uuid], [0], [ignore])
+
+# Now clear lb3 vips.  The logical flow db group
+# should have reference only to sw3, sw4 and sw5 because lb2 is
+# associated to them.
+
+check as northd ovn-appctl -t ovn-northd inc-engine/clear-stats
+check ovn-nbctl --wait=sb clear load_balancer lb3 vips
+check_engine_stats lflow recompute nocompute
+CHECK_NO_CHANGE_AFTER_RECOMPUTE
+
+lb_lflow_dp=$(ovn-sbctl --bare --columns logical_datapath list logical_flow 
$lb_lflow_uuid)
+AT_CHECK([test "$lb_lflow_dp" = ""])
+
+lb_lflow_dpgrp=$(ovn-sbctl --bare --columns logical_dp_group list logical_flow 
$lb_lflow_uuid)
+AT_CHECK([test "$lb_lflow_dpgrp" != ""])
+
+dpgrp_dps=$(ovn-sbctl --bare --columns datapaths list logical_dp_group 
$lb_lflow_dpgrp)
+
+echo "dpgrp dps - $dpgrp_dps"
+
+AT_CHECK([echo $dpgrp_dps | grep $sw0_uuid], [1], [ignore])
+AT_CHECK([echo $dpgrp_dps | grep $sw1_uuid], [1], [ignore])
+AT_CHECK([echo $dpgrp_dps | grep $sw2_uuid], [1], [ignore])
+AT_CHECK([echo $dpgrp_dps | grep $sw3_uuid], [0], [ignore])
+AT_CHECK([echo $dpgrp_dps | grep $sw4_uuid], [0], [ignore])
+AT_CHECK([echo $dpgrp_dps | grep $sw5_uuid], [0], [ignore])
+
+AT_CLEANUP
+])
+
 OVN_FOR_EACH_NORTHD_NO_HV([
 AT_SETUP([Logical router incremental processing for NAT])
 
-- 
2.43.0

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